Fix trailing whitespace in .cpp, .h, and .idl files

Source/core/dom/MouseEvent.idl

Index: Source/core/dom/MouseEvent.idl
diff --git a/Source/core/dom/MouseEvent.idl b/Source/core/dom/MouseEvent.idl
index 516cb1e288dfc08d877f5c90e5bc084689297c73..92c3bfb518a679d32abeb73f82e31f7d4527f185 100644
--- a/Source/core/dom/MouseEvent.idl
+++ b/Source/core/dom/MouseEvent.idl
@@ -32,21 +32,21 @@
     [InitializedByEventConstructor] readonly attribute EventTarget      relatedTarget;
                                     readonly attribute long             webkitMovementX;
                                     readonly attribute long             webkitMovementY;
-    
-     void initMouseEvent([Default=Undefined] optional DOMString type, 
-                                       [Default=Undefined] optional boolean canBubble, 
-                                       [Default=Undefined] optional boolean cancelable, 
-                                       [Default=Undefined] optional Window view, 
-                                       [Default=Undefined] optional long detail, 
-                                       [Default=Undefined] optional long screenX, 
-                                       [Default=Undefined] optional long screenY, 
-                                       [Default=Undefined] optional long clientX, 
-                                       [Default=Undefined] optional long clientY, 
-                                       [Default=Undefined] optional boolean ctrlKey, 
-                                       [Default=Undefined] optional boolean altKey, 
-                                       [Default=Undefined] optional boolean shiftKey, 
-                                       [Default=Undefined] optional boolean metaKey, 
-                                       [Default=Undefined] optional unsigned short button, 
+
+     void initMouseEvent([Default=Undefined] optional DOMString type,
+                                       [Default=Undefined] optional boolean canBubble,
+                                       [Default=Undefined] optional boolean cancelable,
+                                       [Default=Undefined] optional Window view,
+                                       [Default=Undefined] optional long detail,
+                                       [Default=Undefined] optional long screenX,
+                                       [Default=Undefined] optional long screenY,
+                                       [Default=Undefined] optional long clientX,
+                                       [Default=Undefined] optional long clientY,
+                                       [Default=Undefined] optional boolean ctrlKey,
+                                       [Default=Undefined] optional boolean altKey,
+                                       [Default=Undefined] optional boolean shiftKey,
+                                       [Default=Undefined] optional boolean metaKey,
+                                       [Default=Undefined] optional unsigned short button,
                                        [Default=Undefined] optional EventTarget relatedTarget);
 
     // extensions